Bio-based composite material and preparation method thereof

The invention discloses a bio-based composite material and a preparation method thereof.The bio-based composite material is mainly prepared from sawdust, starch and/or a starch-containing material, stearic acid and plant fibers as structural materials, the starch and the stearic acid are mixed with hot water and then subjected to physical gelatinization and polymerization reaction at high temperature, and the naturally degradable bio-based composite material is prepared. The product is environment-friendly, low in cost and good in structural force. Although the binding force of the sawdust is lower than that of waste paper, cost control is facilitated. The composite material provided by the invention adopts natural materials, does not need to add toxic, harmful and difficult-to-degrade plastic components, does not need to additionally add chemical adhesive components, can be recycled and degraded, and is non-toxic and harmless, and the components are low in cost and easy to obtain. The raw materials of the bi